榆林市榆阳区退耕还林林地侧柏生长情况调查

Investigation on Growth of Platycladus orientalis in the Forest Land Converted from Farmland in Yuyang District of Yulin City

通过对相同的土壤和不同的立地类型所选出的10个7年生侧柏样地进行生长情况调查，结果表明，退耕还林林地侧柏在阳坡的下坡生长最好，平均高达1．44m，在阳坡的上坡和阴坡的中坡最差，而在其他立地则居中。另外在所有样地中树高在1～1．4m之间达54％，在1．4～1．8m达27％，而在1m以下和1．8m以上则不足20％。侧柏总体上生长较好，生长也迅速，能很好地在干旱瘠薄的黄土高原上生长。

The growth of 7-year-old Platycladus orientalis in 10 sample plots within different site types and same soil is investigated. Result shows that： Platycladus orientalis grow best in the downhill of the sunny slope with an average height of 1.44 m, grow worst in uphill of sunny slope and midslope of shady slope, grow medium in other sample plots. In all sample plots, the tree heights which are during 1-1.4 m ＆ 1.4 -1.8 m constitute 54% ＆ 27%, respectively, but the tree heights which are under 1 m and over 1.8 m are less than 20%. In general, Platycladus orientalis are able to grow well and fast in arid and barren loess plateau.